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+/*********************                                                        */
+/*! \file nl_lemma_utils.h
+ ** \verbatim
+ ** Top contributors (to current version):
+ **   Andrew Reynolds
+ ** This file is part of the CVC4 project.
+ ** Copyright (c) 2009-2019 by the authors listed in the file AUTHORS
+ ** in the top-level source directory) and their institutional affiliations.
+ ** All rights reserved.  See the file COPYING in the top-level source
+ ** directory for licensing information.\endverbatim
+ **
+ ** \brief Utilities for processing lemmas from the non-linear solver
+ **/
+
+#ifndef CVC4__THEORY__ARITH__NL_LEMMA_UTILS_H
+#define CVC4__THEORY__ARITH__NL_LEMMA_UTILS_H
+
+#include <tuple>
+#include <vector>
+#include "expr/node.h"
+
+namespace CVC4 {
+namespace theory {
+namespace arith {
+
+/**
+ * A side effect of adding a lemma in the non-linear solver. This is used
+ * to specify how the state of the non-linear solver should update. This
+ * includes:
+ * - A set of secant points to record (for transcendental secant plane
+ * inferences).
+ */
+struct NlLemmaSideEffect
+{
+  NlLemmaSideEffect() {}
+  ~NlLemmaSideEffect() {}
+  /** secant points to add
+   *
+   * A member (tf, d, c) in this vector indicates that point c should be added
+   * to the list of secant points for an application of a transcendental
+   * function tf for Taylor degree d. This is used for incremental linearization
+   * for underapproximation (resp. overapproximations) of convex (resp.
+   * concave) regions of transcendental functions. For details, see
+   * Cimatti et al., CADE 2017.
+   */
+  std::vector<std::tuple<Node, unsigned, Node> > d_secantPoint;
+};
+
+}  // namespace arith
+}  // namespace theory
+}  // namespace CVC4
+
+#endif /* CVC4__THEORY__ARITH__NL_LEMMA_UTILS_H */